<script setup>
import { User, Lock } from '@element-plus/icons-vue'
import { ref, watch } from 'vue'
import { userRegisterService, userLoginService } from "@/api/user.js";
import {ElMessage} from "element-plus";
import { useUserStore } from "@/stores/index.js";
import { useRouter } from "vue-router";

const isRegister = ref(false)
const form = ref()   // 用于获取组件实例
// 注册
// 整个用于提交的数据对象
const formModel = ref({
  username: '',
  password: '',
  repassword: ''
})
// 整个表单的校验规则
// 1. 非空校验 required 是否允许非空   message 提示信息    trigger 何时校验（blur失去焦点时校验, change改变的时候校验）
// 2. 长度校验 min: 长度校验
// 3. 正则校验 pattern: 正则规则    \S 非空字符
// 4. 自定义校验 => 自己写校验逻辑
//     validator: (rule, value, callback)
//      (1) rule 当前校验规则相关信息
//      (2) value 所校验的表单元素目前的表单值
//      (3) callback => 无论成功还是失败 都需要 callback 回调
//                   - callback() 校验成功
//                   - callback(new Error(错误信息)) 校验失败
const rules =
    {
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur'},
    { min: 5, max: 10, message: '用户名必须是 5-10位 的字符', trigger: 'blur'}
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur'},
    { pattern: /^\S{6,15}$/, message: '密码必须是 6-15位 的非空字符', trigger: 'blur'}
  ],
  repassword: [
    { required: true, message: '请输入密码', trigger: 'blur'},
    { pattern: /^\S{6,15}$/, message: '密码必须是 6-15位 的非空字符', trigger: 'blur'},
    { validator: (rule, value, callback) => {
        // 判断当前 value 和 当前 form 中收集的 password 是否一致
        if(value !== formModel.value.password) {
          callback(new Error('两次输入的密码不一致'))
        } else {
          callback()   // 校验成功 也需要 callback 回调
        }
      },
      trigger: 'blur'
    }
  ]
}

const register = async () => {
  // 注册成功之前 预校验 校验成功 -> 请求   校验失败 -> 自动提示
  await form.value.validate()
  await userRegisterService(formModel.value)
  ElMessage.success('注册成功')
  isRegister.value = false
}

const userStore = useUserStore()
const router = useRouter()
const login = async () => {
  await form.value.validate()
  const res = await userLoginService(formModel.value)
  //console.log(res)
  if(res.data.code === 0) {
    userStore.setToken(res.data.token)
    ElMessage.success('登录成功')
    router.push('/').then(r => res)
  } else {
    router.push('/login').then(r => res)
    ElMessage.error('登录失败')
  }
}

// 切换的时候  重置表单内容
  watch(isRegister, () => {
    formModel.value = {
      username: '',
      password: '',
      repassword: ''
    }
  })
</script>

<template>
  <!--  1. 表单校验相关
            (1) el-form =>  :model="ruleForm"     绑定整个form的数据对象 { xxx, xxx, xxx }
            (2) el-form =>  :roles="roles"        绑定整个rules规则对象  { xxx, xxx, xxx }
            (3) 表单元素 => v-model="ruleForm.xxx"  给表单元素，绑定form的子属性
            (4) el-form-item => prop配置生效的是哪个校验规则 （和rules中的规则要对应）
  -->

  <el-row class="login-page">
    <el-col :span="12" class="bg"></el-col>
    <el-col :span="6" :offset="3" class="form">
      <el-form ref="form" :model="formModel" :rules="rules" size="large" autocomplete="off" v-if="isRegister">
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input v-model="formModel.username" :prefix-icon="User" placeholder="请输入用户名"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
              v-model="formModel.password"
              :prefix-icon="Lock"
              type="password"
              placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item prop="repassword">
          <el-input
              v-model="formModel.repassword"
              :prefix-icon="Lock"
              type="password"
              placeholder="请输入再次密码"
          ></el-input>
        </el-form-item>
        <el-form-item>
          <el-button class="button" type="primary" auto-insert-space @click="register">
            注册
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = false">
            ← 返回
          </el-link>
        </el-form-item>
      </el-form>

      <!--   登录表单   -->
      <el-form :model="formModel" ref="form" :rules="rules" size="large" autocomplete="off" v-else>
        <el-form-item>
          <h1>登录</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input v-model="formModel.username" :prefix-icon="User" placeholder="请输入用户名"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
              name="password"
              v-model="formModel.password"
              :prefix-icon="Lock"
              type="password"
              placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox>记住我</el-checkbox>
            <el-link type="primary" :underline="false">忘记密码？</el-link>
          </div>
        </el-form-item>
        <el-form-item>
          <el-button class="button" type="primary" auto-insert-space @click="login">
            登录
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = true">
            注册 →
          </el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>

<style lang="scss" scoped>
.login-page {
  height: 100vh;
  background-color: #fff;
  .bg {
    background: url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
    url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }
  .form {
    display: flex;
    flex-direction: column;
    justify-content: center;
    user-select: none;
    .title {
      margin: 0 auto;
    }
    .button {
      width: 100%;
    }
    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  }
}
</style>